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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac86b9c82bc9e17131a3463bcf3d58754b45922dd854260a4209ea4452574f8' 
  AND token = 'o++vg8bXdH9F4y8IQHOCG+cnA94fXp0Mox1DkEP41yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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