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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0ca298e338e3b414e4725964a7e65c064d5d8fe8db79b015e1afd5bfbb8d54' 
  AND token = 'vLuP7/63qiu/uNA0rXBoYmFlecWF0u7G3QryrAtfrQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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