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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd145493da376256938a312ed762376906fd69ecc872bad3e5341fea0b7f8a418' 
  AND token = '0F3vsdfjUtevlge3XrGAZDprMp+XaF4ej3ij7ABsZYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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