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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dea998754d1fe7a6ae9fe622e54672c9cfa3851294e5a4b327236b12362567' 
  AND token = 'E/XmESw7Re67MfCTDr+3svvb1JIy14D2cm+H9u4x0tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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