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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23eedb850c33c4512d820cd52b9aee6542bd10f985efe7818b0f7daf94a8084a' 
  AND token = 'RauPVztK21CoNfLDHTKwA4BF101VRaWBTPZFsnc2d98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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