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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06996b875908b7eee3ac86320f6287fc6d638cd541fa1f2f9e73b25a9e14b25d' 
  AND token = 'g/bDGtjWZD23ks2O7Vx3xEr8vykLksKPBM6/bg4DUhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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