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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7a28f3f3fdbbb0304a656c1f947ca24246a04e450f442727b5f073bb4d64d7' 
  AND token = 'QgM9CjcjNcErUlldNCGPWh6fDNgr5poEimAcZ+0ll14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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