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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5c5d56e28b7019145bb1ac162393bdec308a38a92dc20a26b242c9b6170d1e' 
  AND token = 'DXTfCCr1dA0h1CRaJAa4iN75Qs/20GQriT+ORwR3WNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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