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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e691189b62c1f2af58bd51c939dc3de0463737d6f94750eecb9ad3735dbd555f' 
  AND token = 'F1Cmm7OB5g1YnbEyPL2MqSM0btbQL76Lf2jRIT85W+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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