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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d60945a7d6085d44a0246d2cc622eb7e51b9bbb94e93eef64a6a9c5a1fccbe' 
  AND token = 'Qf7yL6bXdAYJTqxCRjbXK89C8avANlX9ujSUquQ9BQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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