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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8edeee66f97340b4838bca6deb5ec14111d7b8f4f33f608e6322589295367b38' 
  AND token = '16cqexuejMksFzZ6jwjCLjr4M6nBBXmwS7rz6Z9sjVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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