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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e00be013e29b998060e294272d6e06933b6120c62bd082331c99aec5f14d0e' 
  AND token = 'RZ7BzO+kM6qWipXLb4i7pUlax12Zg4mCEJETjcFqFa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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