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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89337b4afce4a9ff85ab2888f006468ce5d24f33ec5dd6716ecf7236ddea84b' 
  AND token = '0vnW8Ny+ArlKxoyd5pZgZhBK86i3sn3ayS2OnfENEiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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