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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dce87e098904f467491163be108fe6546a73723975b215c780015a7712ae114' 
  AND token = 'dus5pyrL7XI5fhz/WNvzd336UzGcLgR+JtOC6jPGFPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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