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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eefe506025608a12ffead886c04b87ff01fa6a95f5afb157824ad97bd482ff5' 
  AND token = '8bfEy38nj16LQfC8bQzNYgO5gpfpMCiHVy0aSBOFoPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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