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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e402474b00fe5d78e3d0d47582a1ca4810f6e59260984f6e971d6333c134cfc' 
  AND token = 'l/mF5zKACkltYSR18OZ12YJQPS4QibkY69jyUuYgkqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}