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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5b9a36d7fb6ed4eb7c498ade8b01b11d56fe736111ef54d21ab1d8a1119b87' 
  AND token = 'B3/xb4KmDgBgBpUo4KGEF1yKCX1rwG7lUcwQ8zxQ4vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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