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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab94ca05e25357e37645f5f9cc7c652251d1c5ffbd0784199314628680503f2e' 
  AND token = 'Hzsb8OKsPIRjyHtXIc4ZxDN2xnmhfh5h5BLT5zNOuP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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