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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde5a2d0bc354f7bd17ac62d7d252417a77847585b50c6e423adc282198691bf' 
  AND token = 'JzpW2WMXeej28cD1ufqaI4McyY1DESAyOG3rTTOFYtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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