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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7804e43ff32d2868dd252e8094af129b6ea39875f62ad3e53bbd98fe094a9a' 
  AND token = 'HaIRtpogZ7ZQnWw9hTE9YFbO6B7+iZw8wpLEDTb/Zcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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