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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519fa980996bc7fe9016f88bd9b1b0d3b65180633ebfdf714d26643844c0e90d' 
  AND token = 'HTYHhPhn21E2ISGGXyUYCRwx/II+YCHs4Gqi22QqqSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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