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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e23ac5b8747a46b769e914c65acef8d581e0f3c9c8e2a780230f5abc96b6088' 
  AND token = 'TND+iaVv8yGBZUQvcXw37OQqBhqj3N4xwAchUZ4qp84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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