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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7ee2def45d1cfd2b8a2f8fc1a30472cb79c94bbddb9be14c8e296c05fbb9cf' 
  AND token = '8umnzNN6u0xkD/smb037WMyLy7IW0lnLf4t1BWIAu48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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