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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536eb55515a4fb32d863e9eba8a42cea1704109019d17b27d5be0b662d08694c' 
  AND token = 'acBR5vROYE0IrTYiMpfWkShr24Ob9GconVkfnSCE+ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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