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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3c975b2234c23e1edd59a525da00fada4f31e32dcef3286e8387a39c20d97d' 
  AND token = '+IecX4Xc7NSzVazCSrZOkGIRAGPQNrMjwOC3GEFsExc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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