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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed111cd590ef7df32ed7789deb676e3b223325540552fa69c3f021924d90c192' 
  AND token = 'fXXv1xCCDou+r9oAlvT8Aqzcwal7wyS5mmEZ85coQGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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