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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db7a04b7e40936b1f8821be9c56d0cb2cdb7dd732cb30ae64c5c038d58e278b' 
  AND token = '+oCF0/sXAROMbjNXr9gzTINL6EsWN+3QKok3cQSGpok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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