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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc258ae7d9ee1da3d1e8e66012de437e79c248918a66f9a6cf9893bc767dfc4a' 
  AND token = '0Z566Glfp1mVY5Ln72NH9O6KanLHv0J/HJdVYRCw2FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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