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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac4b6b4fce6a92d058dcb0e7dcbd0c46059da49b255fac8ff12be0bebf18dad' 
  AND token = '/QRmicGqui+Kq4AI1l2ObObFDKvg1ix/g2iiGJZ9aJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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