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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a210d75bd1dc41eb7ae7b9cd4b80e73e96c3565d4afed97b4e24efbfb743b9a9' 
  AND token = 'Pa7QePUkkQGNORH++6GPsGaLIA9cQrwkthDf0WZd0Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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