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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e7448a3daba641b9fa85d971d592be77e2e558d14c7d39d726a972718baab8' 
  AND token = 'hvhuiZcSrY/Sq+ijRtuaE+P+I0ulBAB1Ldqsoe0hdLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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