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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf2dbb15c0d04c39ee8e1c6c3e4a6c1c0e46c1c2b82a657e742c4ba2a40b7f1' 
  AND token = 'PrZWmXpd5DVfSbZ74X5uN02hqdxC+0348J3iQA+Uqls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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