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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0975121ff6400e4b6f4352259185a54645f03de9b9baacdc564dc1ab8ef17fc5' 
  AND token = 'b3+BuUC1qESJyWTh00d99bXn6pckTySIzYT1V8zTFAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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