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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7477b4911921730f59de019d3c6c48a99fa54cd8a9556765553ffca2e4357e' 
  AND token = '2ZqozFMIGf5aL21oKBnWiGHFz4ODVA5pBZT2QlqIRRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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