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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254c85cc54d00b96c8630c8eeac2fe3875af07021fee1508b9a1f98447abf432' 
  AND token = 'SH2LrhjyXTHro5qNqa+nGs9gMNOn29QX5k+3y/QJvrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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