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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce55376d299e71994f490d0a96a8d5992c6ff9a7bd5162a54019c1836da3655' 
  AND token = 'Fn/aRjHiH1J9VdvXjGOsznc7O8JbtUHT4EbR/v1hX8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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