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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f9cfe0ac6638e2282c898fc93f1454a7a28c3b0b65e95ea956cafced776ce5' 
  AND token = '+L6oYvMo5gJCjTRfrR+W6U3nJAkVNmvPUxcJokzDgmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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