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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98863b61526772bb224942764b3c5638acfaeb107cc3b2360ba6be7549a8b6ba' 
  AND token = '29/dpRV3gbk7KfzjdJwo5f0v4zIkZx4ViqXRJ294WRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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