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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7a2d0d0c0ed1297d0b0ca6e2774be19247b69ba1a52bdb71bca7ff5afacf52' 
  AND token = 'xMWdLrNkgLNbACzAkVF8BpE2oVqHyCkKnTZIQ8mnN7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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