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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a29528b6091d96f0177f83171271f9ed7a9c52b51f95493b821504121fe91a5' 
  AND token = 'd7G7oYIR54zKrPfe24eCv60WD3JcJ17CPpSbvQ8wR0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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