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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0362e08b8fdf4f762749c29e97f7b8387df0ffed90a4f9721b6686b9829ed3a6' 
  AND token = '9nw2xyXLdPy3TddVR+STZ7v3bvyHcckoI/PvuC9k6H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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