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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f792836b04893ba7609499fd028e012d6cb9fc9c8ce6d8e0709983c9c7792a' 
  AND token = 'pWuzlt7mgD4UauPBoA59bx9ArzLmH+MhA1F9uTaWgJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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