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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5d1a97b350977616f7e6903a851226c4756213f3964e2771c184e4e90360c5' 
  AND token = 'oAyGchgPzaD6DT0ijun9GtATkC9OroNL7QGeEX1aOUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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