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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e5549b28ecb6f85a839982a99f00470a6e48a3797253c67090398f12168deb' 
  AND token = '4fdh13q70m3EcJgDi6ShuclpbBHuJoeX5wnw9Nh1GXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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