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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5015026ec6050eb35ab05be4c742c2af698ae216affdc5300ae537ea226c186' 
  AND token = 'bxwDUZkf0Jkv/2hy6qRg0NM5b4cvWwy/URASFo96/G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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