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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9f207428a2a1c2c39253901b17119f356f8911b9f79d9c591da57494fafbd3' 
  AND token = 'aPQD3SuiLJLoER9rAqKKfE7FtBwsrg6Zdw4mVu4Auns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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