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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb03674c906992ae87e6379575a40a9e34fd6dbb7a835a2588d16f7e50611211' 
  AND token = 'w0BsCwWEN83cvEKy9bZZ+TNcR+61xVDEHa+hyazq+Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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