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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fff1c47660058233f729c5e5d53bbbdacf14798c847d41eeb8054ca6c1bca34' 
  AND token = 'hN/U6lK3Z802FvKYpFtBd/u7Yk35fbC+bdc5s/XIPsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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