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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02030ae634c8ad06affc8a945c7d92186af18a9d7ce1ebb6d4ea3d5782955ee' 
  AND token = '9X1+DAGt+O69rwWrvZI3nTtZLtsdiHZB8eFWJypUvtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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