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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b935181ba944893ba5efdbe347a0fc2555761bc216ef5b633d6b8f1035c6a3c9' 
  AND token = 'qpiIXcGkqtH7s8jiZ31pj8n3zBG99wUs4DmPf2aMm2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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