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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed5f3140cd7f61cb0a751ba1fdcc965283a6aef488fca2a26f1c6d7a4b04138' 
  AND token = 'iIhCRl0QQvyHR7rXFJ11fvG+pu9S7ayt+xOpcsdvoxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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