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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fc291f0f68ad43f906e4cd72bc18a4885b1a14ecfd8452197b0a6054b59cf9' 
  AND token = 'OEPWcXUg+ykLM7ci8JBTeNpD0Bv3O6VTTADSfW7DMA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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