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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01034363f5ae0a79b1fd5e51fc947fb6a4bc61c07bb91fe6ea15a7137127b7d7' 
  AND token = 'MmgNO+EPwEm3wjFOlY94dzJ6cvmgzl44g2RGsklfuHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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