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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b713941d58d985e602d7f937f765f9700fe79aceceaf2d9b01ee9fbd26d7185' 
  AND token = 'tfcffw0C6+2pTeaaWGkXRzvR5jBey1vHu0oCY3+/Jn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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