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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98cd35e2b9481b9413148ab5fd571b52a27dee1e43bbe4f664ea1d94e32d188' 
  AND token = 'vM34y0b3lrxH5WmPjefcTgZkdHOwzb1FLsNmzZOjjig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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