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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2947046897baba247d4fcd2aaf44052ac4a4e0d56d0c38b01fa21c5f7009ba5c' 
  AND token = 'me1q3XQcWtUpzx/cZp2zc3UEMKs4XlThDk5xl/KKgZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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