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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8aad2463fbefd37332b19289b3209f83a2a9b9e34778fe9e17f5e12843aa8c' 
  AND token = '4L2kv1jkZOorABfH6Laqq+ynyx9eqmu3WT8txViu234=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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