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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a53bad71cf0eb79d9847f707244ccc530400337eba92759848042fd66975a03' 
  AND token = '82wimkfoOzlv15EXDg9ryEn/TBMfYWuHxsr/uveAkTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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