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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee110ced23af28d24d37d4b4a625de952b47599ab5c73dab6c9ae0cff4e2e2ab' 
  AND token = 'TmTZ1Wk3esM07ZEaq0Q7B8wvQyqXZCtj/6AGINsnOe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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