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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb81139e59e196b809c21ae97bf9e149ba058f83464e41ab7bd9e0b229ba001c' 
  AND token = 'WJIEitXn6R5xRbf7kw+F6GLHpi1L4kXBgHui5sOJ3Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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