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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859036b2ce21eff7f609f690f37a06d2a55ac5d0842a5e10414eb5ec7edf0abc' 
  AND token = 'KJ5Eq4tbuEoHaFg5O4GJTnLU017bp0bOz+nBRQ/DVyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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