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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e4552c1aee9ab8f63d040a2cde473a6f8d5fc882d232444e2a5b6d3d9d9786' 
  AND token = 'nHAizNkXuwbfPQLKHMeMfj08Nw920RUX/RQU8PtpTHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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