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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8950a39ad58b6c1a4af866f9b56aefcd2f0d43ae0cc3158cc02476b5cfb40bb0' 
  AND token = 'WreM9igVTnU2FPyzIVf/ic5gI6zN9t35ObxacQ5yZk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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