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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13f863b073b42d979cc23ebedd7490e0ad31534c77d040f86073503ed33b1c6' 
  AND token = 'XtQfaKC3GeawBSquXD+GzGCyU5epZqNw2tmvr79eTBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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