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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665914e18970c55f388b4d7393ce0ef5cdc7425cb3f17722cab2651f3bd9e75c' 
  AND token = '6EJ4iQ9LVCl02+cpPEV3VtCHlmR44JHqKIPZBJZPOc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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