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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432bf0224f423f9531a70f91568373cb37cc764cd41113dcc4fd43a2423b9f4d' 
  AND token = '59z5OabQEpEYKiLOxzZiOhzzhl3zqwPpzdx6+r9cesA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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