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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15db6cab6b4a555465e2456ed8077690ac2a170aaaa92e4da8928329b7f56ce6' 
  AND token = 'e1Avl5i/GucOKdG1ZsV4AQiQt/HzjnalAHumf+IT9Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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