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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbbdb5ad4000a7abf7ecf42a8a6dd11d6799ae38e825d2fa2c59bca3f7f8f68' 
  AND token = 'qOgv0I1tKMihgnPbFDecpLt4uo9nfI90tdsuSURDN7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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