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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f258bfeb1c842f2933f06bfad94adf02297ed1e2f8a1c0f4784c4ff78faf49ae' 
  AND token = 'tnPS9bD+luvGVBrcj9ypD/QzGZUn4oMLb6ad67oOe6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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