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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b504fafc39b76b3cc257f520382c75d0be68954bc42d18157018fd0d8b7801e9' 
  AND token = 'CmFsiWf2Y60L/LScfGtm+pyVgKE+2enLM2NuI9W8dWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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