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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0fefd774087c7b582b64eb34030bcf76c39826f6b1a32b61785f3a6faa454f' 
  AND token = 'dY/6KebRHL5Q/byX1i89cbM15Gk7exVy6DZ0v0zmKAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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